Universal, Oxygen Sensor Bung, Standard Oxygen Sensor Bung, Mild Steel (Bag of 5, Bulk Pack), Standard Oxygen Sensor Bung, Mild Steel (Bag of 5, Bulk Pack), S.S. FITTINGS, Exhaust Bungs, Vibrant Performance Standard Oxygen Sensor Bung is made of 304 Stainless Steel and mild steel., MSO2SensorBung5Pack.